The various load cell types include hydraulic, pneumatic, and strain gauge. Strain gauge load cells are the most common in industry. These load cells are particularly stiff, have very good resonance values, and tend to have long load balancing techniques pdf cycles in application. Deformation of the strain gauge changes its electrical resistance, by an amount that is proportional to the strain.
The change in resistance of the strain gauge provides an electrical value change that is calibrated to the load placed on the load cell. The output of the transducer can be scaled to calculate the force applied to the transducer. 24-bit, can be used directly. The gauges themselves are bonded onto a beam or structural member that deforms when weight is applied. In most cases, four strain gauges are used to obtain maximum sensitivity and temperature compensation. Two of the gauges are usually in tension can be represented as T1 and T2,and two in compression can be represented as C1 and C2, and are wired with compensation adjustments.